=== 1. URI reader ===
^1^2^3^4^5^6^7^
|href=|'|www.|google.|com/a.|html|"|
|href=| | |google.|com| | | 
| | | |google.|com| | | 
| | |www.|google.|com| | |

  * ** group 1 ** optional hyperlink indicator depends if it is an active link on the page
  * ** group 2 ** optional delimiter 
  * ** group 3 - 5 ** repeating group of pattern //\text&dot\//
  * ** group 6 ** ending of URI, which can be file extension or top class domain name 
  * ** group 7 ** optional delimiter

    * syntactical solution: //(href= ){0,1}['\|"]{0,1}([0-9a-zA-Z_/]{1,*}[\.]){1,*}[0-9a-zA-Z]{2,4}['\|"]{0,1}//
    * <code>wget --quiet -O - http://www.csszengarden.com | grep -E "[a-z][a-zA-Z0-9+.-]*:\/\/([a-zA-Z0-9+.-_]+@)*[a-zA-Z0-9+.\-]+(:[0-9]+)*\/([a-zA-Z0-9+_.\-]+\/)*([a-zA-Z0-9+_#?=.\-]+(&|;)*)*" -o</code>
    * result: <code>vding@fx160-08:~$ wget --quiet -O - http://www.csszengarden.com | grep -E "[a-z][a-zA-Z0-9+.-]*:\/\/([a-zA-Z0-9+.-_]+@)*[a-zA-Z0-9+.\-]+(:[0-9]+)*\/([a-zA-Z0-9+_.\-]+\/)*([a-zA-Z0-9+_#?=.\-]+(&|;)*)*" -o 
http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd
http://www.w3.org/1999/xhtml
http://www.bluerobot.com/web/css/fouc.asp
http://www.csszengarden.com/favicon.ico
http://www.csszengarden.com/zengarden.xml
http://www.mezzoblue.com/zengarden/resources/
http://www.mezzoblue.com/zengarden/submit/
http://www.mezzoblue.com/zengarden/resources/
http://www.mezzoblue.com/zengarden/submit/guidelines/
http://creativecommons.org/licenses/by-nc-sa/1.0/
http://www.mediatemple.net/
http://www.amazon.com/exec/obidos/ASIN/0321303474/mezzoblue-20/
http://validator.w3.org/check/referer
http://jigsaw.w3.org/css-validator/check/referer
http://creativecommons.org/licenses/by-nc-sa/1.0/
http://mezzoblue.com/zengarden/faq/#s508
http://www.mezzoblue.com/zengarden/faq/#aaa
http://www.ericstoltz.com/
http://skybased.com/
http://www.kevinaddison.com/
http://www.pixel-house.com.au/
http://www.benklemm.de/
http://www.re-bloom.com/
http://rpmdesignfactory.com/
http://users.skynet.be/bk316398/temp.html
http://www.mezzoblue.com/zengarden/alldesigns/
http://www.mezzoblue.com/zengarden/resources/
http://www.mezzoblue.com/zengarden/faq/
http://www.mezzoblue.com/zengarden/submit/
http://www.mezzoblue.com/zengarden/translations/
</code>
explain: // wget // will get the file from www.csszengarden.com quietly (without output to avoid garbage) and immediately truncate it then pass it to // grep //. Group1 can actually contain digits and special characters as long as it is not on the first position followed by ":\/\/". Then the repeating group of dot separated strings, then the repeating group of slash separated strings. Finally end with almost any character. 


=== 2. phone number reader ===
^1^2^3^4^5^6^
|+|31|(0)|35|-|12345678|
|00|31| |35| |12345678|

** Group 1 ** can either be a + sign or 00. \\ 
** Group 2 ** must be digits, 1 to 3 letters long, but with first letter not being 0. \\ 
** Group 3 ** is an optional "(0)". Sometimes people use brackets around 0, sometimes don't. \\ 
** Group 4 ** is similar to group 2. It consists of 1 to 3 letters, with first letter not being 0. \\
** Group 5 ** is the optional - \\ 
** Group 6 ** is the number string with 7 to 8 letters, with first letter not being 0. \\  

  * solution: // (+/00)[1-9][0-9]{0,2}(\(0\))?[1-9]{1,3}(-)?[1-9][0-9]{6,7} // 
  * BASH syntax: // ^\([+]\|[0]\{2\}\)[1-9][0-9]\{1,2\}\([\(][0][\)]\)\{0,1\}[1-9]\{1,3\}[-]\{0,1\}[1-9][0-9]\{6,7\} // \\ 

my phone number in different forms saved in file 'phonenumber' and corresponding grep -E command 
<code>
+31(0)624820296
+31624820296
+31(0)6-24820296
+316-24820296
0031624820296
0031(0)624820296
0031(0)6-24820296
00316-24820296


grep -E ^\([+]\|[0]\{2\}\)[1-9][0-9]\{1,2\}\([\(][0][\)]\)\{0,1\}[1-9]\{1,3\}[-]\{0,1\}[1-9][0-9]\{6,7\} phonenumber 

</code>
 
** improvement **
=== 3. bash comment remover with grep ===

Line with only comments I can think of is a line start with #. So I will search for a # at the begin of the line and match all the rest of the line.

  * solution: [^\][#]{*}[.]{*}
  * syntax: grep -E [^\][#]{*} scriptsrc
Every string contains # and not leading by escape will be filtered.

<code bash>
#!/bin/bash
### MySQL Server Login Info ###
MUSER="root"
MPASS="MYSQL-ROOT-PASSWORD"
MHOST="localhost"
MYSQL="$(which mysql)"
MYSQLDUMP="$(which mysqldump)"
BAK="/backup/mysql"
GZIP="$(which gzip)"
### FTP SERVER Login info ###
FTPU="FTP-SERVER-USER-NAME"
FTPP="FTP-SERVER-PASSWORD"
FTPS="FTP-SERVER-IP-ADDRESS"
NOW=$(date +"%d-%m-%Y")
#tester 2
[ ! -d $BAK ] && mkdir -p $BAK || /bin/rm -f $BAK/* #tester

DBS="$($MYSQL -u $MUSER -h $MHOST -p$MPASS -Bse 'show databases')"
for db in $DBS
do
 FILE=$BAK/$db.$NOW-$(date +"%T").gz
 $MYSQLDUMP -u $MUSER -h $MHOST -p$MPASS $db | $GZIP -9 > $FILE
done

lftp -u $FTPU,$FTPP -e "mkdir /mysql/$NOW;cd /mysql/$NOW; mput /backup/mysql/*; quit" $FTPS
#grep -E ^[\#]\{1,\} scriptsrc
</code>
The last line is the command. I used the command to filter out the comment lines, do not know how to replace them with empty line